816856206 has 16 divisors (see below), whose sum is σ = 1650555984. Its totient is φ = 269478144.

The previous prime is 816856181. The next prime is 816856223. The reversal of 816856206 is 602658618.

It is a super-2 number, since 2×816856206² = 1334508122561428872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701185 + ... + 702348.

It is an arithmetic number, because the mean of its divisors is an integer number (103159749).

Almost surely, 2^816856206 is an apocalyptic number.

816856206 is an abundant number, since it is smaller than the sum of its proper divisors (833699778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816856206 is a wasteful number, since it uses less digits than its factorization.

816856206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1403635.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 816856206 is about 28580.6963875970. The cubic root of 816856206 is about 934.7924676899.

The spelling of 816856206 in words is "eight hundred sixteen million, eight hundred fifty-six thousand, two hundred six".